The timer you have is a fairly standard component. It can be used for either delay on or delay off operation depending on how it is wired.
Before power is applied to pins 2 and 7, the normally open contacts (1-3 and 8-6) will be open and the normally closed contacts (1-4 and 8-5) will be closed. When power is applied to pins 2 and 7 after the delay time then the above situation will reverse.
If you can provide a more detailed description of what you are trying to do, perhaps I can help with a specific circuit diagram. Is there an existing circuit it will be added to?
Make it fit.
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